Slur-preventing mechanism for printing presses



Jan. 16, 1945. G. N. KROUSE SLUR-PREVENTING MECHANISM FOR PRINTING PRESSES Filed Jan. 19, 1944 I INVENTOR. 6? fiifiraw e BY Patented Jan. 16, 1945 7 iii":

SLUR-PREVENTING MECHANISM PRINTING PRESSES FOR Glen N. Krouse, Columbus, Ohio Application January 19, 1944, Serial No. 518,855

6 Claims. (01. 101-420) paperboard sheet undergoing printing and the last line of type of the chase or form, whereby to overcome blurring of the printed impressions on the trailing edge of the sheet. I

.The mechanism forming the present invention is used in the printing industry to prevent what is known as slur, a word used to describe the misplaced ink caused by sliding of the free or trailing end of the paper being printed on the ink type. The prevention of slur has been a problem with printers for years, and has been tediously eliminated in practice by drivin tacks at the edge of the last line of type held in a chase or form. Such an operation is makeshift at best and consumes considerable costlytime. In accordance with the present invention, an automatic mechanism is provided in conjunction with the reciprocating type bed whereby when impressions are printed on a paper sheet by the last line of type of the bedor chase, the trailing edge of the paper is lifted automatically from engagement with the type, preventing sliding of the paper and thereby overcoming the causeof slurring.

Fora further understanding of the invention, reference is to be had to the following description and the accompanying drawing, wherein:

, Fig. 1 is a fragmentary plan view of the reciprocating type bed of a printing press, andillustrating the slur-preventing means, forming th present invention, in association therewith;

Fig.2 is a detail verticalsectional view on an enlarged scale disclosing the slur-preventing means in the type bed and illustrating the sheetlifting fingers in their lowered or inactive positions;

Fig. 3 is a similar view taken on the plane disclosed by the line 33 of Fig. 1

Fig. 4 is a transverse vertical sectional view onthe line 4-4 of Fig. 3; v

Fig. 5 is a vertical longitudinal sectional view Fig. "I is a vertical transverse sectional view on the line 1-1 of, Fig. 1.

Referring more particularly to the drawing,

the numeral [0 designates the frame-mounted reciprocating type bed or chase of a conven-' tional printing press, and the numeral H desig- M hates the tympan-carrying oscillatory cylinder, the cylinder being geared, as usual, in connection with the bed or chase, so that as the latter reciprocates, rocking motion is imparted to the cylinder.

Clamped within the chase adjacent to the last line of type 12 thereof is the slur-preventing mechanism M forming the present invention.

This mechanism, in the preferred embodiment thereof illustrated in the drawing, comprises a bar It having its upper surface longitudinally grooved as at M. Positioned in this groove, and substantially coextensive with the length thereof, is a half round rocker member or rod Hi. This member is adapted to oscillate about its longitudinal axis and is held in the groove M by means of pinsIB, the latter having curved upper ends H which engage with the flat upper surfaces lB of the rocker member at a position substantially in registration with its longitudinal axis, so that while the pins 16 prevent the rocker member from moving upwardly in the groove of the bar l3, they do not interfere with limited rocking movement of said member. The shanks of the pins 16 are received within vertical sockets 19 provided in the bar l3, and set screws 20, mounted in threaded openings 2| formed transversel in the bar I3, may be used to secure frictionally the pins in their operative positions.

At one end, at least, the rocker member I5 is provided with a longitudinally projecting eccentrically disposed pin 22, which is received within a slot 23 provided in a vertically movable plunger 24. This plunger is mounted within the bed or chase ID at one end of the rocker member l5, and is maintained normally in an elevated position by the use of a leaf spring 25. The latter is secured by means of the screws 26 to the under side of the bar l3, and the free end of said spring engages with a recess 21 in the lower end of the shank 28 of said plunger, thereby holding in an elevated position the laterally enlarged T- shaped head 29 of the plunger in a plane above the upper surface of the bar I3. The upper surface of said bar is provided at longitudinally spaced intervals with a plurality of resilient wire sheet-lifting fingers 3|] which, as shown in Fig, 2, are normally disposed in a plane below the printing surfaces of the type 12, the fingers being secured inoperative association with the bar I3 y means of the headed screws indicated at 3|.

the last line of type imparts an impression therei to, the head of 255 of the plunger 2a. is engaged by the periphery of the cylinder ii. Such engagement results in the depressionof the plunger against the resistance exercised by the spring 25. This downward movement of the plunger imparts an oscillatory or rocking motion to the member l5, as a result of the eccentric location of" the pin 22 and its position in the slot 23 of. the plungershank. The rocking movement thus imparted to the member 15 effects the elevation of the trailing edge of the paper sheet, bringing said fingers into their active positions and lifting the trailing edge of the paper sharply from the last lineof type, thereby overcoming blurring or slurring which so frenquently occurs in the average print- .ing press when the trailing edge of the paper sheet slides overthe last line of type. The fingers 30 press the trailing edgeof the paper sheet against the tympan surface of the cylinder H, holding the sheet firmly so that its trailing edge will not have wiping engagement with the last line of type in the chaserform. Since the fingers 30- are resilient, the same may be flexed by the action of cylinder ll without injury, suchflexing serving to increase theirclamping action on the paper sheet. The construction of the slurpreventing mechanism is such that it does not in any way interfere with the inking of the type surfaces nor in any way interfere with any other normal press operations, its only function being to eliminate slur.

Having thus described my invention, what I claim is:

1. In a printing press, a reciprocable type-holding chase and a sheet-advancing cylinder arranged over the type contained within said chase, a rocker member supported by said chase contiguous to the last line of type carried thereby, resilent sheet-lifting fingers fixed to said rocker member, and means actuated by said cylinder when the latter is in registration with the last line of type in said chase for rocking said member and elevating the resilient fingers carried thereby to maintain the trailing edge ofa paper sheet disposed between the type and cylinder in spaced relation fromsaid last line of type:

2. The combination with a type formcontai n ing set-up type, of astationary bar.within said form, a movablenon-printing rocker-bar-mounted' on said stationary bar, a pluralityof spacedapart resilient fingers having certain of the ends thereof fixed to said rocker bar; a cylinder; and meansactuated by said cylinder during. the passage of the type form thereunder for oscillating said bar and thereby effecting the elevation of said fingers.

3. The combination with a printing couple comprising a reciprocable bed forcarrying the form and a cylinder for carrying the sheet to beprinted; of a type form containing" the type-and a slur eliminator disposed in saidform comprising a fixed bar having a longitudinal groove inits upper surface, a rocking bar'disposedlongitudinally in said groove for oscillating movement, a plurality of spaced-apart resilient fingers carried by said rocking bar, a spring-pressed plunger engageable with said cylinder during the passage of said form thereunder to produce vertical movement on the part of said plunger, and eccentric means operable to efiect oscillation of said rocking bar when said plunger is depressed by said cylinder.

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4. Slur-eliminating mechanism for printing presses comprising a stationary bar adapted to be locked in a type-containing chase, a rocker bar mouhted for oscillation on the upper longitudinal surface of said stationary bar, resilient lifting fingers carried by said rocker bar and projecting laterally therefrom, a depressible plunger carried by said chase contiguous to said stationary bar, and means operable when said plunger is depressed to impart oscillating motion to said rocker bar and the figers carried thereby.

5. Chase carried slur-eliminating mechanism for printing presses comprising astationary bar having a longitudinally grooved upper surface, a semi-cylindricalrocking member having itsrounded outer surfaces disposed longitudinally in the groove of said stationary bar, a pluralityof resilient sheet-lifting fingers having the inner ends thereof fixed to'the plane upper surface of said rocking bar; a substantially T-shaped plunger having the vertical shank thereof disposed forvertical sliding movement adjacent to one end of said stationary bar, resilient means carried by said stationary bar and serving to maintain said plunger in-an elevated position, the shank of said plunger being provided with a transverse slot, and an eccentrically'disposed pin projecting longitudinally from one end of said rocking bar-and arranged-within the slot of said plunger, whereby when said plunger is depressed, oscillating motion isimparted to said rocking member and the lifter fingers carried thereby.

6. Chase carried slur-elminating mechanism for'printing pressescpgnprising a stationary bar having a longitudinally grooved upper surface, a semi-cylindricalrocking-bar having the rounded outer surfaces thereof positioned in said groove, a plurality of resilient lifting fingers having the inner ends thereof" stationarily" secured to thefiat upper surface of'said rocking bar, the free ends of said fingers projecting laterally and upwardly from the rocking "bar, pins carried by saidstationary bar, said pins having hook-shaped upper extremities engageable centrally with the fiat upper surfaces of said rocking bar to maintain the latter in the groove. of said stationary bar, a vertically movable plunger having an elongatedhorizontally disposed head portion arranged above said stationary bar, a centrally disposed depending shank supported for vertical sliding movement at one end of said stationary bar, spring means carried, by said stationary bar and engageable with the shank of said plunger to yieldably maintain the same in an elevatedposition, and an, eccentrically arranged pin projecting longitudinally from one end of said locking bar and positioned in a slot provided in the shank of said plunger, whereby when, said plunger is depressed, oscillatory motion is imparted. to said .rocking bar and the resilient fingers, carried. 

